Abstract: Magneto-optically active waveguides suitable for use in high temperature environments are constructed of a magneto-optically active waveguiding body composed of a first crystalline aluminum garnet, which is clad with an epitaxially deposited layer of a second crystalline aluminum garnet. The second crystalline aluminum garnet has a lower refractive index than the first crystalline aluminum garnet.

Abstract: This invention provides birefringent optical waveguide structures of crystalline aluminum garnet of a high refractive index which are clad with crystalline aluminum garnet of a lower refractive index. Due to predetermined lattice mismatch between garnet substrate and cladding layer, strain is induced which causes a stress with resultant birefringence in the waveguide layer. When linearly polarized light enters such stressed waveguide in certain orientations, the linear polarization will be preserved by the stress-induced birefringence. These birefringent clad waveguides can be in the form of slabs, channels, ribs, or any of the typical optical waveguide structures. They are useful at high temperature.

Abstract: Optical waveguides suitable for use in high temperature environments are constructed of a waveguiding body composed of a first crystalline aluminum garnet, which is clad with an epitaxially deposited layer of a second crystalline aluminum garnet. The second crystalline aluminum garnet has a lower refractive index than the first crystalline aluminum garnet.

Abstract: A temperature compensated strain gauge amplifier derives compensating signals for offset and gauge errors of bridge transducers from a single temperature sensing element. The amplifier is inexpensive to construct, provides a high degree of voltage linearity with respect to temperature and is reliable in operation.

Abstract: A method of growing optical quality .beta.-BaB.sub.2 O.sub.4 crystals involves growing these crystals from a fluxed melt of BaB.sub.2 O.sub.4, Na.sub.2 O and NaCl, in certain proportions.

Abstract: An inductance coil serves as a displacement sensor arranged in connection with a tuned circuit of an oscillator. Liquid level displacement in an LEC crystal growth environment is sensed as a frequency change in the oscillator circuit as compared to a set point value. The sensor is protected from the environment by an outer protective sheath of non-conductive, non-contaminating material such as boron nitride.

Abstract: A magneto-optical element comprises a magnetic garnet layer on a crystalline substrate. The garnet layer has a faceted structure, which provides high Faraday rotation and controlled coercivity. The faceted structure is preferably formed by depositing the layer onto a substrate whose lattice constant is sufficiently smaller than that of the layer. The resulting elements find application in light modulators, such as switches and displays, where they permit high resolution without having to be cut into an array of small cells.

Abstract: A multi-layer luminescent screen includes a luminescent crystalline sublayer and a faceted overlayer. The faceted overlayer causes the emission from the screen of a greater fraction of the luminescence than would otherwise be the case. The screens, which are typically cathodoluminescent, find application in computer displays, lithography, and flying spot scanners.

Abstract: Certain Tm-containing iron garnet compositions provide layers having desirably high values of Curie temperature and magnetic anisotropy and permit the fabrication of devices having 1.2 .mu.m diameter magnetic bubbles. The compositions, based on Tm-substitution on dodecahedral sites of [(La,Bi)(Sm,Eu),(Ca,Sr),R].sub.3 (Fe,Si,Ge).sub.5 O.sub.12, are grown by liquid phase epitaxy onto suitable substrates. Bubble devices that incorporate the layers find applications in high density information storage.

Abstract: Certain Tm-containing iron garnet compositions provide layers having desirably low values of temperature coefficient of bubble collapse field and permit the fabrication of 1.2 .mu.m diameter magnetic bubble devices. The compositions, based on Tm-substitution on dodecahedral sites of [(La,Bi),(Sm,Eu),R].sub.3 (Fe,Al,Ga).sub.5 O.sub.12, are grown by liquid phase epitaxy onto suitable substrates. Bubble devices that incorporate the layers find applications in high density information storage.